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Depends on the brand, how it is installed ("hard" installed or slide-out or lift-out unit), whether a prefilter or UV light unit has to be moved out of the way to remove it, what material it is made of if there are options for your unit (some offer variations of aluminum, copper, cast iron, and stainless steel evaporator coils), local labor costs (presumably low in your area) - and how much the contractors in your area are marking materials up. I have seen several construction building trades articles recently on trends in some market areas for the contractors to, in a very short time (less than a year) escalate their materials markups from the normal 10-25% range to 100% or more - in my area I have seen markups exceeding 300% over wholesale for in-demand items like high-efficiency over-55 gallon water heaters, tankless water heaters, and full-size replacement windows and sliding glass doors.

You can read through some replies on the subject of evaporator replacement cost, and the economics of replacing it versus buying a totally new unit (especially if existing one is old or Freon based) in the Home > HVAC link in Browse Projects, at lower left, if you wish - but your true answer will be after you get 3 responsive bids and compare them to see what the "market" price in your area is for your specific unit and situation.

I know at least a couple of the comments in that section addressed "in-warranty" evaporator changeouts costing in the $1200 range - meaning the evaporator failed in warranty so the manufacturer replaces it for free or only the shipping cost, so the $1200 number would be mostly or totally labor and incidental materials cost in those cases. However, I know a lot of evaporators run in the $300-800 range so a $1200 installed bill can be in the ballpark - so depends on a lot of factors for which only competitive bids will resolve the "fair price" question meaningfully.